Recording and indicating gage.



H. S. DOLBEY (2: L. E. MIGHON.

RECORDING AND INDIGATING GAGE.

APPLICATION FILED MAR.11,1910.

Patented Feb. 7, 1911.

2 SHEETS-SHEET 1.

I WV H. S. DOLBEY & L. E. MIGHON. RECORDING AND INDIGATING GAGE. APPLICATION FILED MAR.11,1910. Patented Feb. 7, 1911.

2 SHBETSSHEET 2.

. companying drawings "NT H E- HARRY s. DOLBEY AND LOUIS E. MICHQN, OF PROVIDENCE, RHODE ISLAND.

RECORDING AND INDIGATING GAGE.

Specification of Letters IPatent.

10 all whom it may concern:

Be it known that we HARRY S. "Domain: and Louis E. MIGHON, both citizens of the United States, residing at Providence, in the county-of Providence and State of Rhode Island, have invented certain new and useful Improvements in Recording and Indicating Gages, of which the following is a specification.

Our invention relates to that type of devices for gaging the quantity of liquid or gases flowing through a supply pipe, where- "in the flow is determined by .the pressures or differences in pressures at different points in .the pipe. The latter in this instance is a Venturi tube as described in United States Patent No. 381,373.

The essential objects of our invention are to both indicate the differences of pressure, and to make a constant visual indication of the same upon a regularly graduated chart; to attain these ends in a simple inexpensive, structure having a minimum of parts and com rising a, single column, and to avoid the inaccuracies resultant upon the use'of a traveling body of--mercury.

Other objects and advantages will be here inafter, referred to. To the above ends primarily our invention consists ofan apparatus or mechanism possessing certain claimed features "of construction and relative arrangement of parts, one form thereof being illustrated upon the acforrning a part of this spelcification and now to be described in de; 11:11 In the drawings Figure 1 is a front elevation of our novel apparatus; Fig. 2, a central transverse section of the same showin parts in side elevation; Fig. 3, a section 0% the same taken on line w w of Fig. 2, and Fig. 4 a section on line y y of Fig. 3.

Like reference characters indicate like parts throughout the views. g In the drawings 4 is a base of any suitable form supporting a vertically disposed cylindrical casing 5 preferably provided with a conical lower portion 6 and a closed top 7 y The casing has intermediate its length a transtherewith a vertical cylinder 9 with open.

' respectively,

ries of graduations uid passing through The partition 8 divides the easing; into upper. and lower compartments 11 and 12 respectively. Transversely of the chamber 11 is a supporting strip 14 fixed to a flange 15 of the casing. In the bottom of chamber 12 is mercury 17 into which extends a float 18 of a shape somewhat resembling a truncated cone with a concave side 19 Lhav- 20 which is of smallest di-- ing its lower face ameter in the mercury. In the top of the float is a vertical rod 22 upon which is fixed by nuts 23 or otherwise a piston 24 which operates in the cylinder 9. The upper portion of the rod, which extends through an opening 26 in the strip 14, is provided with teeth 27 which constitutes a rack engaging a pinion 29 fixed to a horizontal rod or shaft 30, journaled in uprights 31 fixed to the strip 14 and in a stutfing box 32 upon the wall of the casing. A guide arm 34' also upon the strip 14 engages the smooth portion of the rack. Supported by arms 36 and 37 upon the side of the casin 5 is a casing 39 in whose front wall is fixegfone above the other glass observation openings 40 and 41 and whose rear wall 42 is provided with an opening 43 to permit the passage therethrough of the shaft 30 upon whose end is fixed a pointer 44 which moves over the face of a dial 45 supported by arms 46 extending from The dial 45 is provided with an annular se- 47 the graduation marks of which are equidistant, and indicate by pressure or volume units the quantity of liqtime. Fixed upon the shaft 30 is a pinion 48 which engages the teeth of a rock bar 50 jslidablg mounted in guides 51 upon the back wall 0 the casing. A pencil 53 is attached to the lower end of the bar 50 which acts which is attached in upon a sheet 54 a disk 55 mounted any suitable manner to upon a shaft 56 uniformly revolved by clock work in a housing 57 upon the casing wall 42. The sheet 54 constitutes a record or chart and is provided with radial graduations indicative of time, and with concentric graduations to represent a definite num' ber of gallons or other units.

The main pipe 58 has the usual convergv Patented Feb. '7, 1911. Application filed March 11, 1910. Serial No. 548,735.

the wall of the casing 39.

the main pipe at any the combination of a casing a main pipe, an ad acent receptacle comprising two chamstructed ing section 59, throat 60, and diverging sec- I tion 61 through which the liquid or gas to be I measured flows in the direction of the arrows. A pipe (52 connects the portion of the pipe 58 adjacent the converging section as at (33 with the cylinder casing, opening into the chamber 11; and a pipe (54; connects the throat G0 with the cylinder casing, opening into the chamber 12. When no flow Wis tak ing place in the main pipe the pressure at the points 63 and 60 is equal, and the float 19 is only slightly submerged in the mercury 17, and the piston is elevated. WVhen the flow begins the pressure at the throat is relatively diminished, and the greater pressure of the liquid or gases passing through the pipe 62 acts in the chamber 11 to force the piston 24 and the float 19 downwardly, movement being indicated upon the dials 45 and 5a through the described rack and pinion connections. Since the specific gravity of the float is less than that of the mercury, the downward thrust of the piston is opposed by the buoyancy of the float.

It is essential in order to secure the full utility of the dials that some means be devised for equalizing the distances between their radial graduations, which'would otherwise be at constantly increasing intervals around the dials due to the fact that the pressure inthe main pipe increases at a rate measured by a square of the velocity. To attain this desired end the float 19 is so conas to compensate for the increasing ratio of pressure. This is attained by proportioning the resistance of the float at an inverse ratio to the velocity of the water in the pipe, namely, the cross sectional dimension of the float is continually increasing upwardly to such a degree that the intensity of the resistance upon the float by the mercury increases sufficiently, as the float descends, to compensate for the ratio of increase of the pressure in the main pipe.

What we claim is,

float upon the rod the combination of a main the chambers with 1. In an apparatus of thedescribed class,

bers, means connecting said chambers at two points in the main pipe, a rotatable shaft mounted in the casing, av reciprocating rod in thereceptacle, means whereby said rod is operatively connected with the shaft, said rod extending into both chambers, a c linder in said receptacle, and 'a piston in sai cylinder and upon the rod intermediate the chainbers positioned by the difference between the pressures at two points in the main pi e.

2. In an apparatus of the described class,

the combination of a main pipe, a single ad Jaoent receptacleprovided with a closed bottom and comprising an upper and lower chamber adapted to retain fluids of different pressures, means connecting said chambers at two points in the main pipe, a rotatable shaft mounted in the receptacle and extending into the upper chamber, a reciprocating rod in the receptacle extending into both chainbers, means whereby said rod is operatively connected with the shaft, a cylinder in said receptacle and a piston in saidcylinder and upon the rod intermediate the chambers positioned by the difl'erence in pressure at two points in the main pipe.

3. In an apparatus of the described class, the combination of a main pipe, an adjacent receptacle, a partition in the receptacle forming an upper and a lower chamber adapted to retain fluids under differentpressures, a stationary body of mercury in the lower chamber, a. cylinder in the partition opening into both chambers, a piston in the cylinder, a rod upon which the piston is mounted extending into both chambers, a in the lower cylinder, a rotary shaft mounted in the upper chamber of the receptacle, means whereby said shaft is operatively connected with the rod, and

conductors connecting the chambers with the main pipe at different points of pressure.

4. In an apparatus of the described class, pipe, an adjacent receptacle, a partition dividing the receptacle into an upper and lower chamber, a stationary body of mercury in the lower chamber, a cylinder in the partition, a piston in the cylinder, a reciprocating rod to which the piston is fixed extending into both cylinders, a float upon the rod resting in the mercury, said float having an upwardly increasing cross sectional area, a pivoted pointer, means actuated by the rod for operating the pointer, and conductors connecting the main pipeat different points of pressure.

5. In an apparatus of the described class, the combination with a receptacle provided with a closed bottom, of a partition in the receptacle .orming upper and lower chambers, a cylinder in said partition, a piston in said cylinder intermediate the chambers, a rod connected to the piston, a main pipe, means connectin the main pipe with the upper chamber or moving the piston downwardly, and means confined in the lower chamber for resisting the downward movement of the piston. 1

6. In an apparatus of the described class, the combination with a receptacle comprising an upper and lower chamber, of a partition between the chambers, a cylinder in the partition, a stationary body of mercury in the lower chamber, a piston'in the cylinder, a rod 'connected to the piston provided with a rack portion, a float on the rod adapted to be immersed in the mercury, a support in the receptacle above the partition, bearings In testimony whereof we have afiixed our on the support, a shaft mounted in the bearsignatures in presence of two witnesses.

in s a pinlon on said shaft engaging the razk portion of the rod, means actuated by 1 the rotation of said pinion by said rack, and

conductors connectin the chambers with Witnesses: the main pipe at di rent points of pres: HORATIO E. BELLOWs, sure. WALTER LOUIS Fnosr. 

